Pulmonary artery dissection causing haemothorax in a cat: potential role of Dirofilaria immitis infection and literature review

A 7-year-old male castrated domestic short-haired cat suddenly died. Gross examination revealed severe right-sided haemothorax with blood clots, four adult filarial nematodes in the blood clots and the caudal vena cava and haemorrhage dissecting into the tunica media of the right pulmonary artery. H...

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Bibliographic Details
Published in:Journal of veterinary cardiology 2017-02, Vol.19 (1), p.82-87
Main Authors: Biasato, I., Tursi, M., Zanet, S., Longato, E., Capucchio, M.T.
Format: Article
Language:English
Subjects:
Aneurysm, Dissecting - parasitology
Aneurysm, Dissecting - veterinary
Animals
Cat Diseases - parasitology
Cats
Dirofilaria immitis
Dirofilariasis - complications
Feline
Heart
Heartworm disease
Hemothorax - parasitology
Hemothorax - veterinary
Male
Pulmonary Artery
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Summary:A 7-year-old male castrated domestic short-haired cat suddenly died. Gross examination revealed severe right-sided haemothorax with blood clots, four adult filarial nematodes in the blood clots and the caudal vena cava and haemorrhage dissecting into the tunica media of the right pulmonary artery. Histopathological investigation showed fibrosis of the tunica intima and disorganization/fragmentation of the elastic fibres accompanied by fibrous tissue deposition in the tunica media of both branches of pulmonary artery. Degenerative vasculopathy (intimal fibromuscular hyperplasia and medial hypertrophy/hyperplasia) involving pulmonary arteries was also observed. The polymerase chain reaction amplification and sequencing confirmed the identification of the parasite as Dirofilaria immitis. A diagnosis of pulmonary artery dissection with haemothorax and concomitant heartworm disease was formulated. Degenerative processes of the tunica media have been reported to cause pulmonary artery dissection in both humans and animals. Pulmonary artery remodelling induced by heartworms may be considered the underlying cause in the first case of feline pulmonary artery dissection, herein described.
ISSN:1760-2734
1875-0834
DOI:10.1016/j.jvc.2016.08.004